x11-links: Update to 1.18

Changes:
1.18
----
 - Add missing headers present in include/libdrm of NetBSD-current

Index: Makefile
===================================================================
RCS file: /cvsroot/pkgsrc/pkgtools/x11-links/Makefile,v
retrieving revision 1.188
diff -u -p -r1.188 Makefile
--- Makefile	25 Apr 2019 09:03:06 -0000	1.188
+++ Makefile	10 May 2019 11:00:41 -0000
@@ -4,7 +4,7 @@
 #	the x11-links dependency in buildlink3.mk to the correct version,
 #	usually the most recent.
 
-PKGNAME=	x11-links-1.17
+PKGNAME=	x11-links-1.18
 CATEGORIES=	pkgtools x11
 
 MAINTAINER=	pkgsrc-users@NetBSD.org
Index: buildlink3.mk
===================================================================
RCS file: /cvsroot/pkgsrc/pkgtools/x11-links/buildlink3.mk,v
retrieving revision 1.79
diff -u -p -r1.79 buildlink3.mk
--- buildlink3.mk	25 Apr 2019 09:03:06 -0000	1.79
+++ buildlink3.mk	10 May 2019 11:00:41 -0000
@@ -12,7 +12,7 @@ BUILDLINK_TREE+=	x11-links
 .if !defined(X11_LINKS_BUILDLINK3_MK)
 X11_LINKS_BUILDLINK3_MK:=
 
-BUILDLINK_API_DEPENDS.x11-links+=	x11-links>=1.17
+BUILDLINK_API_DEPENDS.x11-links+=	x11-links>=1.18
 BUILDLINK_PKGSRCDIR.x11-links?=		../../pkgtools/x11-links
 BUILDLINK_DEPMETHOD.x11-links?=		build
 
Index: files/xorg.libdrm
===================================================================
RCS file: /cvsroot/pkgsrc/pkgtools/x11-links/files/xorg.libdrm,v
retrieving revision 1.13
diff -u -p -r1.13 xorg.libdrm
--- files/xorg.libdrm	5 Mar 2019 19:56:50 -0000	1.13
+++ files/xorg.libdrm	10 May 2019 11:00:41 -0000
@@ -2,14 +2,19 @@
 #
 include/X11/xf86drm.h
 include/X11/xf86mm.h
+include/libdrm/amdgpu.h
+include/libdrm/amdgpu_drm.h
 include/libdrm/drm.h
 include/libdrm/drm_fourcc.h
 include/libdrm/drm_mode.h
 include/libdrm/drm_sarea.h
 include/libdrm/i915_drm.h
+include/libdrm/intel_aub.h
 include/libdrm/intel_bufmgr.h
+include/libdrm/intel_debug.h
 include/libdrm/mach64_drm.h
 include/libdrm/mga_drm.h
+include/libdrm/nouveau.h
 include/libdrm/nouveau/nvif/cl0080.h
 include/libdrm/nouveau/nvif/cl9097.h
 include/libdrm/nouveau/nvif/class.h
@@ -18,7 +23,9 @@ include/libdrm/nouveau/nvif/if0003.h
 include/libdrm/nouveau/nvif/ioctl.h
 include/libdrm/nouveau/nvif/unpack.h
 include/libdrm/nouveau_drm.h
+include/libdrm/qxl_drm.h
 include/libdrm/r128_drm.h
+include/libdrm/r600_pci_ids.h
 include/libdrm/radeon_bo.h
 include/libdrm/radeon_bo_gem.h
 include/libdrm/radeon_bo_int.h
@@ -30,6 +37,7 @@ include/libdrm/radeon_surface.h
 include/libdrm/savage_drm.h
 include/libdrm/sis_drm.h
 include/libdrm/via_drm.h
+include/libdrm/virtgpu_drm.h
 include/libkms/libkms.h
 include/xf86drm.h
 include/xf86drmMode.h